package com.sky.service.impl;

import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.security.MessageDigest;
import java.time.LocalDateTime;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */

    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对，一个数据库密码（加密密码），一个是前端密码（明文密码）
        // 思路：进行密码比对（把前端密码MD5加密一下，然后与数据库的进行比对）
        String md5Password = DigestUtils.md5DigestAsHex(password.getBytes());
        if (!md5Password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    @Override
    public Integer addEmp(EmployeeDTO employeeDTO) {
        // 把DTO转实体类
        Employee employee  = new Employee();
        BeanUtils.copyProperties(employeeDTO,employee);
        // 设置实体类对象的默认数据
        employee.setCreateTime(LocalDateTime.now());
        employee.setUpdateTime(LocalDateTime.now());
        // 设置登录的用户ID
        employee.setCreateUser(1L);
        employee.setUpdateUser(1L);
        // 设置员工状态
        employee.setStatus(1);
        // 设置默认密码
        employee.setPassword(DigestUtils.md5DigestAsHex("123456".getBytes()));
        return employeeMapper.insertEmp(employee);
    }


    public static String getMD5(String input) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] messageDigest = md.digest(input.getBytes());
            StringBuilder hexString = new StringBuilder();

            for (byte b : messageDigest) {
                hexString.append(String.format("%02x", b));
            }

            return hexString.toString();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}
